<a href="index.jsp">Home Page</a>
<c:if test="${not empty sessionScope.user}">
    &nbsp;
    |
    &nbsp;
    <a href="?style=management&act=food">Food Management</a>
    &nbsp;
    |
    &nbsp;
    <a href="?style=management&act=menu">Menu Management</a>
    &nbsp;
    |
    &nbsp;
    <a href="#">Username: <b>${sessionScope.user.username}</b></a>
    &nbsp;
    <a href="service?do=logout">Logout</a>
</c:if>
<c:if test="${empty sessionScope.user}">
    &nbsp;
    |
    &nbsp;
    <a href="?style=login">Login</a>
</c:if>
<hr />